· My bf & I have been building on our Prusa Mendel for over a year now. The one problem we can''t seem to fix is x-axis skipping or drifting. & I mean about 1cm to the left on almost every single print. Here''s our specs: Prusa Mendel Printrboard running Marlin firmware.9 stepper motors Wade gears extruder with a Jhead Mk IV-b .35mm hotend